Preparation method for chromium-free ZrO2-CaO.ZrO2 composite material for coal-water slurry gasification furnace

A composite material and gasifier technology, applied in the field of refractory materials, can solve the problems of poor thermal shock resistance of high-chrome bricks, affecting the use of gasifiers, spalling, etc., and achieve excellent performance indicators, good social and economic benefits, and cost. low effect

Inactive Publication Date: 2018-07-06
江苏诺明高温材料股份有限公司
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  • Abstract
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Problems solved by technology

[0004] Cr 2 o 3 -Al 2 o 3 -ZrO 2 Brick (nearly 90% Cr 2 o 3 ) has excellent slag erosion resistance, high temperature performance, erosion resistance, thermal shock resistance and thermal spalling resistance. It is currently the main material for the working layer of domestic coal-water slurry pressurized gasifiers, but there are major disadvantages : High raw material cost; Cr 2 o 3 The high volatility makes it

Method used

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  • Preparation method for chromium-free ZrO2-CaO.ZrO2 composite material for coal-water slurry gasification furnace

Examples

Experimental program
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[0015] Example 1

[0016] Chromium-free ZrO for coal water slurry gasifier 2 -CaO·ZrO 2 The preparation method of composite material, (1) Calculated by mole percentage, 10% CaO and 90% ZrO 2 ,Sintering at 1500-1750℃ for a certain period of time to prepare CaO·ZrO 2 Composite materials; (2) In terms of mass percentage, 60% ZrO 2 , 40% CaO·ZrO 2 Composite material, with 3% zirconium sol added as a binder. During production, various raw materials are first weighed according to the ratio, mixed uniformly, and mixed to obtain mud, and then pressed by a friction press to form a shape at 120-250°C. Dry for 10-25h, then sinter at 1550℃-1800℃ for 5-12h.

[0017] The performance indexes of the obtained product are: apparent porosity 15%, bulk density 3.85g / cm 3 , Room temperature compressive strength 140MPa, thermal shock stability (1100℃, water cooling) 27 times, high temperature flexural strength 20MPa, and good hydration resistance, oxidation-reduction resistance, coal ash slag erosion and...

Example Embodiment

[0018] Example 2

[0019] Chromium-free ZrO for coal water slurry gasifier 2 -CaO·ZrO 2 The preparation method of composite material, (1) Calculated by mole percentage, 20% CaO and 80% ZrO 2 ,Sintering at 1500-1750℃ for a certain period of time to prepare CaO·ZrO 2 Composite materials; (2) 65% of ZrO by mass percentage 2 , 35% CaO·ZrO 2 Composite material, plus 3% dextrin as a binder, during production, first weigh the various raw materials according to the proportion, mix them evenly, obtain mud after mixing, and then press the friction press to form, first at 120-250℃ Dry for 10-25h, then sinter at 1550℃-1800℃ for 5-12h.

[0020] The performance indicators of the obtained product are: apparent porosity 14.3%, bulk density 3.92g / cm 3 , Compressive strength at room temperature 155MPa, thermal shock stability (1100℃, water cooling) 29 times, high temperature flexural strength 33MPa, and good hydration resistance, oxidation-reduction resistance, coal ash slag erosion and permeability ...

Example Embodiment

[0021] Example 3

[0022] Chromium-free ZrO for coal water slurry gasifier 2 -CaO·ZrO 2 The preparation method of composite material, (1) Calculated by mole percentage, 30% CaO and 70% ZrO 2 ,Sintering at 1500-1750℃ for a certain time to prepare CaO·ZrO 2 Composite materials; (2) In terms of mass percentage, 60% ZrO 2 , 40% CaO·ZrO 2 Composite material, with 3% zirconium sol added as a binder. During production, various raw materials are first weighed according to the ratio, mixed uniformly, and mixed to obtain mud, and then pressed by a friction press to form a shape at 120-250°C. Dry for 10-25h, then sinter at 1550℃-1800℃ for 5-12h.

[0023] The performance indicators of the obtained product are: apparent porosity 13.5%, bulk density 3.97g / cm 3 , Compressive strength at room temperature 186MPa, thermal shock stability (1100℃, water cooling) 32 times, high temperature flexural strength 48MPa, and good hydration resistance, oxidation-reduction resistance, coal ash slag erosion and p...

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Abstract

The invention relates to a preparation method for chromium-free ZrO2-CaO.ZrO2 composite material for a coal-water slurry gasification furnace, and belongs to the field of refractory materials. The preparation method comprises the following steps: (1) preserving the heat of a CaO source, a ZrO2 source and a bonding agent at 1500-1750 DEG C for a certain time, carrying out sintering to prepare a CaO.ZrO2 composite material with high density and perfect crystal grain development; and (2) crushing the synthesized CaO.ZrO2 composite material into different granular sizes, mixing the synthesized CaO.ZrO2 composite materials with ZrO2 in different granular sizes according to different proportions, adding a proper proportion of a binding agent, adding a proper ratio of a bonding agent, carrying out pressing formation, carrying out drying at 120-250 DEG C for 10-25 hours, and then carrying out high-temperature sintering at 1550-1800 DEG C for 5-12 hours. The product provided by the invention has high compactness, high strength, excellent thermal shock stability, hydration resistance, and coal ash slag erosion resistance and permeability resistance, can meet the use of the coal-water slurrygasification furnace, has high cost performance, does not cause environmental pollution in production and use, can be recycled, and is an environment-friendly material.

Description

technical field [0001] The invention relates to a chromium-free ZrO used in a coal-water slurry gasifier 2 -CaO·ZrO 2 The invention relates to a preparation method of a composite material, which belongs to the field of refractory materials. Background technique [0002] With the dwindling of domestic oil and gas resources, coal gasification technology is more and more used in chemical plants such as coal-to-gas, coal-to-methanol, coal-to-chemical fertilizer, and coal-to-oil. In many coal gasification processes, such as coal-water slurry , Pulverized coal furnace, coal-water slurry gasification process is the most widely used and most successful process technology in China. [0003] The pressurized gasification temperature of coal-water slurry is usually 1300℃~1600℃, which is higher than the ash melting temperature of coal, and the gasification pressure is 2.0MPa-8.5MPa. The furnace is a strong reducing atmosphere, accompanied by solid particles, liquid acid melting The hi...

Claims

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Application Information

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IPC IPC(8): C04B35/482C04B35/622C04B35/626C10J3/48
CPCC04B35/482C04B35/622C04B35/62645C04B2235/3208C04B2235/656C04B2235/77C04B2235/96C04B2235/9669C04B2235/9684C10J3/48
Inventor 钱晶张军杰钱志明黄京衡
Owner 江苏诺明高温材料股份有限公司
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